symbian-qemu-0.9.1-12/qemu-symbian-svp/hostregs_helper.h
author martin.trojer@nokia.com
Fri, 31 Jul 2009 15:01:17 +0100
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Initial QEMU (symbian-qemu-0.9.1-12) import
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/*
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 *  Save/restore host registrs.
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 *
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 *  Copyright (c) 2007 CodeSourcery
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 */
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/* The GCC global register variable extension is used to reserve some
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   host registers for use by generated code.  However only the core parts of
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   the translation engine are compiled with these settings.  We must manually
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   save/restore these registers when called from regular code.
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   It is not sufficient to save/restore T0 et. al. as these may be declared
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   with a datatype smaller than the actual register.  */
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#if defined(DECLARE_HOST_REGS)
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#define DO_REG(REG)					\
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    register host_reg_t reg_AREG##REG asm(AREG##REG);	\
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    volatile host_reg_t saved_AREG##REG;
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#elif defined(SAVE_HOST_REGS)
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#define DO_REG(REG)					\
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    __asm__ __volatile__ ("" : "=r" (reg_AREG##REG));	\
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    saved_AREG##REG = reg_AREG##REG;
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#else
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#define DO_REG(REG)                                     \
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    reg_AREG##REG = saved_AREG##REG;		        \
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    __asm__ __volatile__ ("" : : "r" (reg_AREG##REG));
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#endif
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#ifdef AREG0
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DO_REG(0)
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#endif
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#ifdef AREG1
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DO_REG(1)
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#endif
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#ifdef AREG2
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DO_REG(2)
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#endif
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#ifdef AREG3
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DO_REG(3)
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#endif
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#ifdef AREG4
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DO_REG(4)
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#endif
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#ifdef AREG5
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DO_REG(5)
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#endif
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#ifdef AREG6
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DO_REG(6)
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#endif
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#ifdef AREG7
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DO_REG(7)
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#endif
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#ifdef AREG8
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DO_REG(8)
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#endif
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#ifdef AREG9
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DO_REG(9)
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#endif
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#ifdef AREG10
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DO_REG(10)
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#endif
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#ifdef AREG11
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DO_REG(11)
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#endif
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#undef SAVE_HOST_REGS
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#undef DECLARE_HOST_REGS
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#undef DO_REG